GI.Gtk.Objects.Bin

The Bin widget is a container with just one child. It is not very useful itself, but it is useful for deriving subclasses, since it provides common code needed for handling a single child widget.

Many GTK+ widgets are subclasses of Bin, including Window, Button, Frame, HandleBox or ScrolledWindow.

Exported types

newtype Bin

Memory-managed wrapper type.

Constructors

Bin (ManagedPtr Bin)

Instances

GObject Bin

Defined in GI.Gtk.Objects.Bin

Methods

gobjectType :: IO GType

HasParentTypes Bin

Defined in GI.Gtk.Objects.Bin

type ParentTypes Bin

Defined in GI.Gtk.Objects.Bin

type ParentTypes Bin = Container ': (Widget ': (Object ': (ImplementorIface ': (Buildable ': ([] :: [Type])))))

class (GObject o, IsDescendantOf Bin o) => IsBin o

Type class for types which can be safely cast to Bin, for instance with toBin.

Instances

(GObject o, IsDescendantOf Bin o) => IsBin o

Defined in GI.Gtk.Objects.Bin

toBin :: (MonadIO m, IsBin o) => o -> m Bin

Cast to Bin, for types for which this is known to be safe. For general casts, use castTo.

noBin :: Maybe Bin

A convenience alias for Nothing :: Maybe Bin.

Methods

getChild

binGetChild

Arguments

:: (HasCallStack, MonadIO m, IsBin a)

=> a

bin: a Bin

-> m (Maybe Widget)

Returns: the child of bin, or Nothing if it does not have a child.

Gets the child of the Bin, or Nothing if the bin contains no child widget. The returned widget does not have a reference added, so you do not need to unref it.